Operation Unique Air Systems Note: Eaton recommends that you update using the latest air systems to prevent possible synchronizer failure.
RT & RTO 613 and 6613 Air Systems (With 3-Position Selector Valve) This system consists of a 3-Position Selector valve and an intermediate shift cylinder in addition to the range cylinder. The intermediate shift cylinder shifts the transmission between LO range and intermediate. The range cylinder shifts the transmission between intermediate and direct. Air is supplied to the system at the air supply port (1) by the vehicle's air system. The air filter (2) removes foreign matter from the air then allows it to pass through the air regulator (3) where the pressure is adjusted for 58 to 63 PSI (4.0 daN/cm2). From there the air passes through the supply air hose (4) to the slave valve supply port (5) through the supply air line to the control valve (6).
Control Valve
7 7 8 2
6
1 Air Filter/ Regulator
4
5
3 Intermediate Shift Cylinder
10 Slave Valve
9
Range Cylinder
111
Operation
Depending upon the position of the control button (7), if air passes through the air line (8) connected to the intermediate shift cylinder center port (9) then the intermediate/direct gearing is disengaged. If there is no air, the constant air from the air filter/ regulator assembly (10) moves the intermediate piston forward to engage LO gearing.
